The values in a two dimensional matrix are represented as colors.
Susanna shared this idea
Completed as of Highcharts 4. See http://www.highcharts.com/docs/chart-and-series-types/heatmap/
Awaiting for highchart to integrate Heat map .....
Thanks Mark. I'll take a look and give you feed back.
I released a heatmap plugin for HighCharts:
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